[Rpm-maint] [rpm-software-management/rpm] Error out on --eval if stdout write fails (#1444) (#1562)

[Michal Domonkos]

Since --eval only has one job - to actually *print* something to stdout,
we should fail completely if that's not possible due to an external
error, instead of just not printing anything.  One particular case is
redirecting stdout to a file on a file system that's full (generating
the ENOSPC error).

In order to be able to detect such errors, we need to flush the stream
buffer first; that's because normally, if stdout is not referring to an
interactive device (a terminal), it is block-buffered, as opposed to
line-buffered.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/1562

-- Commit Summary --

  * Error out on --eval if stdout write fails (#1444)

-- File Changes --

    M lib/poptALL.c (4)
    M tests/rpmmacro.at (11)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/1562.patch
https://github.com/rpm-software-management/rpm/pull/1562.diff

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